The number of friends a person has on Facebook is an accurate predictor of the amount of grey matter in certain parts of their brain, according to new research published in Proceedings of the Royal Society B.
Scientists measured the volume of grey matter in 165 adults and looked at the correlation with their number of friends on the social website, Facebook. They found that the more Facebook friends a person had, the larger the volume of their grey matter in several regions of the brain including the amygdala, which is the area responsible for processing memory and emotional responses.
Three other parts of the brain also showed the same trend. These are involved in memory and navigation, perception of social cues, and the ability to recognize a moving object as biological.
The researchers found that the size of an online social network was also an accurate reflection of the number of real-world friends the person had. This suggests social sites such as Facebook are used as a way of keeping in contact with existing friends, rather than for making networks of new virtual friends.
It is not yet clear what is driving the link between brain structure and social network size; people with more grey matter may build larger social networks, alternatively the creation of social networks may affect brain structure.
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A note for you:
Grey matter is a major component in the central nervous system and it is made up of neuronal cell bodies. The grey matter includes regions of the brain involved in muscle control, sensory perception such as seeing and hearing, memory, emotions, and speech.
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